For x≥0 the smallest value of \frac {4x^2 \plus{} 8x \plus{} 13}{6(1 \plus{} x)} is:
<spanclass=′latex−bold′>(A)</span> 1<spanclass=′latex−bold′>(B)</span> 2<spanclass=′latex−bold′>(C)</span> 1225<spanclass=′latex−bold′>(D)</span> 613<spanclass=′latex−bold′>(E)</span> 534 quadraticscalculusfunction